Emerson Rosemount 2051 Reference Manual page 92

Troubleshooting
March 2024
3. Tighten the bolts to the initial torque value using a crossed pattern.
4. Using the same cross pattern, tighten bolts to the final torque values seen in
5.6.5 Install the drain/vent valve
Procedure
1. Beginning at the valve base with the threaded end pointing at the installer, apply
2. Tighten the drain/vent valve to 250 in.-lb. (28.25 N-m).
3. Ensure the opening is placed on the valve so that process fluid will drain toward the
92
four 2.88-inch bolts to mount securely to the coplanar flange. For gauge
pressure configurations, use two 2.88-inch bolts and two 1.75-inch bolts.
• Manifold:
Contact the manifold manufacturer for the appropriate bolts and procedures.
See Table 5-1 for appropriate torque values.
Table 5-1: Bolt installation torque values
Bolt material
CS-ASTM-A445 Standard
316 stainless steel (SST)—Option L4
ASTM-A-193-B7M—Option L5
ASTM-A-193 Class 2, Grade B8M—Option L8
NOTICE
If you replaced the PTFE sensor module O-rings, re-torque the flange bolts after
installation to compensate for cold flow.
Note
After replacing O-rings on Range 1 transmitters and re-installing the process flange,
expose the transmitter to a temperature of +185 °F (+85 °C) for two hours. Then
re-tighten the flange bolts in a cross pattern and again expose the transmitter to a
temperature of +185 °F (+85 °C) for two hours before calibration.
5-1.
two clockwise turns of sealing tape to the threads on the seat.
ground and away from human contact when the valve is opened.
Reference Manual
00809-0100-4101
Initial torque value
300 in.-lb. (34 N-m)
150 in.-lb. (17 N-m)
300 in-lb. (34 N-m)
150 in.-lb (17 N-m)
Emerson.com/Rosemount
Final torque value
650 in-lb. (73 N-m)
300 in.-lb. (34 N-m)
650 in-lb. (73 N-m)
300 in.-lb (34 N-m)
Table